d5167c84f9
If the load is used by any signed setccs, we can use a sextload instead of zextload. Then we don't have to give up on extending the load.
29 lines
739 B
LLVM
29 lines
739 B
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 4
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; RUN: llc < %s -mtriple=riscv64 | FileCheck %s
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define i8 @zext_nonneg_load_i16(ptr %x, ptr %y) {
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; CHECK-LABEL: zext_nonneg_load_i16:
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; CHECK: # %bb.0:
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; CHECK-NEXT: lh a0, 0(a0)
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; CHECK-NEXT: bltz a0, .LBB0_2
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; CHECK-NEXT: # %bb.1: # %cont
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; CHECK-NEXT: add a0, a1, a0
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; CHECK-NEXT: lbu a0, 0(a0)
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; CHECK-NEXT: ret
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; CHECK-NEXT: .LBB0_2: # %exit
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; CHECK-NEXT: li a0, 0
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; CHECK-NEXT: ret
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%a = load i16, ptr %x
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%b = icmp slt i16 %a, 0
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br i1 %b, label %exit, label %cont
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cont:
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%c = zext nneg i16 %a to i64
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%d = getelementptr i8, ptr %y, i64 %c
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%e = load i8, ptr %d
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ret i8 %e
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exit:
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ret i8 0
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}
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