4bbc3290a2
The min/max intrinsic cost is currently too low because in the cost calculation we subtract the cost of the vector compare as we will not emit it. For the cost of the vector compare we are currently passing BAD_ICMP_PREDICATE which returns 3, the worst case cost. I think we should be passing VecPred instead, since we know the predicates of the compare instr. I think this is related to commit b3b993a7ad817 which introduced the predicate argument to getCmpSelInstrCost(). https://reviews.llvm.org/rGb3b993a7ad817c3c5801341fa78f34332900eb83 Differential Revision: https://reviews.llvm.org/D120439
41 lines
1.7 KiB
LLVM
41 lines
1.7 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -slp-vectorizer -mcpu=corei7-avx -mtriple=x86_64-unknown-linux -S | FileCheck %s
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; This test checks whether the cost of the vector max intrinsic is calculated
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; correctly. A max vector intrinsic combines the select and icmp instructions.
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; This maps to a single PMAX instruction in x86.
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define void @smax_intrinsic_cost(i64 %arg0, i64 %arg1) {
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; CHECK-LABEL: @smax_intrinsic_cost(
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; CHECK-NEXT: [[ICMP0:%.*]] = icmp sgt i64 [[ARG0:%.*]], 123
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; CHECK-NEXT: [[ICMP1:%.*]] = icmp sgt i64 [[ARG1:%.*]], 456
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; CHECK-NEXT: [[SELECT0:%.*]] = select i1 [[ICMP0]], i64 [[ARG0]], i64 123
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; CHECK-NEXT: [[SELECT1:%.*]] = select i1 [[ICMP1]], i64 [[ARG1]], i64 456
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; CHECK-NEXT: [[ROOT:%.*]] = icmp sle i64 [[SELECT0]], [[SELECT1]]
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; CHECK-NEXT: ret void
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;
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%icmp0 = icmp sgt i64 %arg0, 123
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%icmp1 = icmp sgt i64 %arg1, 456
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%select0 = select i1 %icmp0, i64 %arg0, i64 123
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%select1 = select i1 %icmp1, i64 %arg1, i64 456
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%root = icmp sle i64 %select0, %select1
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ret void
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}
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define void @umax_intrinsic_cost(i64 %arg0, i64 %arg1) {
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; CHECK-LABEL: @umax_intrinsic_cost(
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; CHECK-NEXT: [[ICMP0:%.*]] = icmp ugt i64 [[ARG0:%.*]], 123
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; CHECK-NEXT: [[ICMP1:%.*]] = icmp ugt i64 [[ARG1:%.*]], 456
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; CHECK-NEXT: [[SELECT0:%.*]] = select i1 [[ICMP0]], i64 [[ARG0]], i64 123
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; CHECK-NEXT: [[SELECT1:%.*]] = select i1 [[ICMP1]], i64 [[ARG1]], i64 456
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; CHECK-NEXT: [[ROOT:%.*]] = icmp sle i64 [[SELECT0]], [[SELECT1]]
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; CHECK-NEXT: ret void
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;
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%icmp0 = icmp ugt i64 %arg0, 123
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%icmp1 = icmp ugt i64 %arg1, 456
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%select0 = select i1 %icmp0, i64 %arg0, i64 123
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%select1 = select i1 %icmp1, i64 %arg1, i64 456
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%root = icmp sle i64 %select0, %select1
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ret void
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}
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