234 lines
7.5 KiB
LLVM
234 lines
7.5 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; Verify that strnlen calls with conditional expressions involving constant
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; string arguments with nonconstant offsets and constant bounds or constant
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; offsets and nonconstant bounds are folded correctly.
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;
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; RUN: opt < %s -passes=instcombine -S | FileCheck %s
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declare i64 @strnlen(i8*, i64)
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@sx = external global [0 x i8]
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@a3 = constant [3 x i8] c"123"
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@s3 = constant [4 x i8] c"123\00"
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@s5 = constant [6 x i8] c"12345\00"
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@s5_3 = constant [10 x i8] c"12345\00abc\00"
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; Fold strnlen(sx + %0, 0) to 0.
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define i64 @fold_strnlen_sx_pi_0(i64 %0) {
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; CHECK-LABEL: @fold_strnlen_sx_pi_0(
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; CHECK-NEXT: [[PTR:%.*]] = getelementptr [0 x i8], [0 x i8]* @sx, i64 0, i64 [[TMP0:%.*]]
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; CHECK-NEXT: [[LEN:%.*]] = call i64 @strnlen(i8* [[PTR]], i64 0)
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; CHECK-NEXT: ret i64 [[LEN]]
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;
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%ptr = getelementptr [0 x i8], [0 x i8]* @sx, i64 0, i64 %0
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%len = call i64 @strnlen(i8* %ptr, i64 0)
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ret i64 %len
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}
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; Do not fold strnlen(sx + %0, %1).
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define i64 @call_strnlen_sx_pi_n(i64 %0, i64 %1) {
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; CHECK-LABEL: @call_strnlen_sx_pi_n(
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; CHECK-NEXT: [[PTR:%.*]] = getelementptr inbounds [0 x i8], [0 x i8]* @sx, i64 0, i64 [[TMP0:%.*]]
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; CHECK-NEXT: [[LEN:%.*]] = call i64 @strnlen(i8* nonnull [[PTR]], i64 [[TMP1:%.*]])
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; CHECK-NEXT: ret i64 [[LEN]]
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;
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%ptr = getelementptr inbounds [0 x i8], [0 x i8]* @sx, i64 0, i64 %0
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%len = call i64 @strnlen(i8* %ptr, i64 %1)
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ret i64 %len
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}
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; Fold strnlen(a3 + %0, 2) to min(3 - %0, 2).
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define i64 @call_strnlen_a3_pi_2(i64 %0) {
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; CHECK-LABEL: @call_strnlen_a3_pi_2(
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; CHECK-NEXT: [[PTR:%.*]] = getelementptr inbounds [3 x i8], [3 x i8]* @a3, i64 0, i64 [[TMP0:%.*]]
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; CHECK-NEXT: [[LEN:%.*]] = call i64 @strnlen(i8* nonnull [[PTR]], i64 2)
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; CHECK-NEXT: ret i64 [[LEN]]
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;
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%ptr = getelementptr inbounds [3 x i8], [3 x i8]* @a3, i64 0, i64 %0
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%len = call i64 @strnlen(i8* %ptr, i64 2)
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ret i64 %len
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}
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; Fold strnlen(a3 + %0, 3) to min(3 - %0, 3).
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define i64 @call_strnlen_a3_pi_3(i64 %0) {
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; CHECK-LABEL: @call_strnlen_a3_pi_3(
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; CHECK-NEXT: [[PTR:%.*]] = getelementptr inbounds [3 x i8], [3 x i8]* @a3, i64 0, i64 [[TMP0:%.*]]
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; CHECK-NEXT: [[LEN:%.*]] = call i64 @strnlen(i8* nonnull [[PTR]], i64 3)
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; CHECK-NEXT: ret i64 [[LEN]]
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;
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%ptr = getelementptr inbounds [3 x i8], [3 x i8]* @a3, i64 0, i64 %0
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%len = call i64 @strnlen(i8* %ptr, i64 3)
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ret i64 %len
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}
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; Fold strnlen(s3 + %0, 0) to 0.
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define i64 @fold_strnlen_s3_pi_0(i64 %0) {
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; CHECK-LABEL: @fold_strnlen_s3_pi_0(
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; CHECK-NEXT: [[PTR:%.*]] = getelementptr inbounds [4 x i8], [4 x i8]* @s3, i64 0, i64 [[TMP0:%.*]]
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; CHECK-NEXT: [[LEN:%.*]] = call i64 @strnlen(i8* nonnull [[PTR]], i64 0)
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; CHECK-NEXT: ret i64 [[LEN]]
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;
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%ptr = getelementptr inbounds [4 x i8], [4 x i8]* @s3, i64 0, i64 %0
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%len = call i64 @strnlen(i8* %ptr, i64 0)
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ret i64 %len
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}
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; Fold strnlen(s5 + %0, 0) to 0.
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define i64 @call_strnlen_s5_pi_0(i64 zeroext %0) {
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; CHECK-LABEL: @call_strnlen_s5_pi_0(
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; CHECK-NEXT: [[LEN:%.*]] = call i64 @strnlen(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @s5, i64 0, i64 0), i64 0)
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; CHECK-NEXT: ret i64 [[LEN]]
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;
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%ptr = getelementptr [6 x i8], [6 x i8]* @s5, i32 0, i32 0
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%len = call i64 @strnlen(i8* %ptr, i64 0)
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ret i64 %len
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}
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; Fold strnlen(s5_3 + %0, 0) to 0.
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define i64 @fold_strnlen_s5_3_pi_0(i64 zeroext %0) {
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; CHECK-LABEL: @fold_strnlen_s5_3_pi_0(
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; CHECK-NEXT: [[PTR:%.*]] = getelementptr [10 x i8], [10 x i8]* @s5_3, i64 0, i64 [[TMP0:%.*]]
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; CHECK-NEXT: [[LEN:%.*]] = call i64 @strnlen(i8* [[PTR]], i64 0)
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; CHECK-NEXT: ret i64 [[LEN]]
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;
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%ptr = getelementptr [10 x i8], [10 x i8]* @s5_3, i32 0, i64 %0
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%len = call i64 @strnlen(i8* %ptr, i64 0)
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ret i64 %len
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}
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; Do not fold strnlen(s5_3 + %0, %1).
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define i64 @fold_strnlen_s5_3_pi_n(i64 zeroext %0, i64 %1) {
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; CHECK-LABEL: @fold_strnlen_s5_3_pi_n(
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; CHECK-NEXT: [[PTR:%.*]] = getelementptr inbounds [10 x i8], [10 x i8]* @s5_3, i64 0, i64 [[TMP0:%.*]]
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; CHECK-NEXT: [[LEN:%.*]] = call i64 @strnlen(i8* nonnull [[PTR]], i64 [[TMP1:%.*]])
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; CHECK-NEXT: ret i64 [[LEN]]
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;
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%ptr = getelementptr inbounds [10 x i8], [10 x i8]* @s5_3, i32 0, i64 %0
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%len = call i64 @strnlen(i8* %ptr, i64 %1)
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ret i64 %len
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}
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; Fold strnlen(a3, %0) to min(sizeof(a3), %0)
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define i64 @fold_strnlen_a3_n(i64 %0) {
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; CHECK-LABEL: @fold_strnlen_a3_n(
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; CHECK-NEXT: [[LEN:%.*]] = call i64 @strnlen(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @a3, i64 0, i64 0), i64 [[TMP0:%.*]])
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; CHECK-NEXT: ret i64 [[LEN]]
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;
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%ptr = getelementptr [3 x i8], [3 x i8]* @a3, i64 0, i64 0
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%len = call i64 @strnlen(i8* %ptr, i64 %0)
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ret i64 %len
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}
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; Fold strnlen(s3, %0) to min(strlen(s3), %0)
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define i64 @fold_strnlen_s3_n(i64 %0) {
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; CHECK-LABEL: @fold_strnlen_s3_n(
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; CHECK-NEXT: [[LEN:%.*]] = call i64 @strnlen(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @s3, i64 0, i64 0), i64 [[TMP0:%.*]])
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; CHECK-NEXT: ret i64 [[LEN]]
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;
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%ptr = getelementptr [4 x i8], [4 x i8]* @s3, i64 0, i64 0
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%len = call i64 @strnlen(i8* %ptr, i64 %0)
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ret i64 %len
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}
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; Fold strnlen(a3 + %0, 2) to min(sizeof(a3) - %0, 2)
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define i64 @fold_strnlen_a3_pi_2(i64 %0) {
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; CHECK-LABEL: @fold_strnlen_a3_pi_2(
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; CHECK-NEXT: [[PTR:%.*]] = getelementptr inbounds [3 x i8], [3 x i8]* @a3, i64 0, i64 [[TMP0:%.*]]
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; CHECK-NEXT: [[LEN:%.*]] = call i64 @strnlen(i8* nonnull [[PTR]], i64 2)
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; CHECK-NEXT: ret i64 [[LEN]]
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;
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%ptr = getelementptr inbounds [3 x i8], [3 x i8]* @a3, i64 0, i64 %0
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%len = call i64 @strnlen(i8* %ptr, i64 2)
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ret i64 %len
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}
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; Fold strnlen(s3 + %0, 2) to min(strlen(s3) - %0, 2)
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define i64 @fold_strnlen_s3_pi_2(i64 %0) {
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; CHECK-LABEL: @fold_strnlen_s3_pi_2(
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; CHECK-NEXT: [[PTR:%.*]] = getelementptr inbounds [4 x i8], [4 x i8]* @s3, i64 0, i64 [[TMP0:%.*]]
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; CHECK-NEXT: [[LEN:%.*]] = call i64 @strnlen(i8* nonnull [[PTR]], i64 2)
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; CHECK-NEXT: ret i64 [[LEN]]
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;
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%ptr = getelementptr inbounds [4 x i8], [4 x i8]* @s3, i64 0, i64 %0
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%len = call i64 @strnlen(i8* %ptr, i64 2)
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ret i64 %len
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}
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; Fold strnlen(s3 + %0, 3) to min(strlen(s3) - %0, 3)
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define i64 @fold_strnlen_s3_pi_3(i64 %0) {
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; CHECK-LABEL: @fold_strnlen_s3_pi_3(
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; CHECK-NEXT: [[PTR:%.*]] = getelementptr inbounds [4 x i8], [4 x i8]* @s3, i64 0, i64 [[TMP0:%.*]]
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; CHECK-NEXT: [[LEN:%.*]] = call i64 @strnlen(i8* nonnull [[PTR]], i64 3)
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; CHECK-NEXT: ret i64 [[LEN]]
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;
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%ptr = getelementptr inbounds [4 x i8], [4 x i8]* @s3, i64 0, i64 %0
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%len = call i64 @strnlen(i8* %ptr, i64 3)
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ret i64 %len
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}
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; Fold strnlen(s3 + %0, %1) to min(strlen(s3) - %0, %1)
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define i64 @fold_strnlen_s3_pi_n(i64 %0, i64 %1) {
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; CHECK-LABEL: @fold_strnlen_s3_pi_n(
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; CHECK-NEXT: [[PTR:%.*]] = getelementptr inbounds [4 x i8], [4 x i8]* @s3, i64 0, i64 [[TMP0:%.*]]
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; CHECK-NEXT: [[LEN:%.*]] = call i64 @strnlen(i8* nonnull [[PTR]], i64 [[TMP1:%.*]])
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; CHECK-NEXT: ret i64 [[LEN]]
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;
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%ptr = getelementptr inbounds [4 x i8], [4 x i8]* @s3, i64 0, i64 %0
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%len = call i64 @strnlen(i8* %ptr, i64 %1)
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ret i64 %len
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}
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; Do not fold strnlen(s5_3 + %0, 2). The result is in [0, 2] but there's
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; no simple way to derive its lower bound from the offset.
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define i64 @call_strnlen_s5_3_pi_2(i64 %0) {
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; CHECK-LABEL: @call_strnlen_s5_3_pi_2(
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; CHECK-NEXT: [[PTR:%.*]] = getelementptr inbounds [10 x i8], [10 x i8]* @s5_3, i64 0, i64 [[TMP0:%.*]]
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; CHECK-NEXT: [[LEN:%.*]] = call i64 @strnlen(i8* nonnull [[PTR]], i64 2)
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; CHECK-NEXT: ret i64 [[LEN]]
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;
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%ptr = getelementptr inbounds [10 x i8], [10 x i8]* @s5_3, i64 0, i64 %0
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%len = call i64 @strnlen(i8* %ptr, i64 2)
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ret i64 %len
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}
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