forked from OSchip/llvm-project
158 lines
4.3 KiB
LLVM
158 lines
4.3 KiB
LLVM
; RUN: llc -mtriple=arm %s -o - | FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-ARM --check-prefix=CHECK-CMP
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; RUN: llc -mtriple=thumb-eabi %s -o - | FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-T --check-prefix=CHECK-CMP
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; RUN: llc -mtriple=thumb-eabi -mcpu=arm1156t2-s -mattr=+thumb2 %s -o - | FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-T2 --check-prefix=CHECK-CMP
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; Check for clipping against 0 that should result in bic
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;
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; Base tests with different bit widths
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;
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; x < 0 ? 0 : x
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; 32-bit base test
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define i32 @sat0_base_32bit(i32 %x) #0 {
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; CHECK-LABEL: sat0_base_32bit:
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; CHECK-CMP-NOT: cmp
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; CHECK-ARM: bic {{r[0-9]}}, [[INPUT:r[0-9]]], [[INPUT]], asr #31
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; CHECK-T2: bic.w {{r[0-9]}}, [[INPUT:r[0-9]]], [[INPUT]], asr #31
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; CHECK-T: asrs [[IM:r[0-9]]], {{r[0-9]}}, #31
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; CHECK-T-NEXT: bics {{r[0-9]}}, [[IM]]
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entry:
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%cmpLow = icmp slt i32 %x, 0
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%saturateLow = select i1 %cmpLow, i32 0, i32 %x
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ret i32 %saturateLow
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}
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; x < 0 ? 0 : x
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; 16-bit base test
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define i16 @sat0_base_16bit(i16 %x) #0 {
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; CHECK-LABEL: sat0_base_16bit:
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; CHECK-CMP: cmp
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; CHECK-ARM-NOT: bic
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; CHECK-T2-NOT: bic.w
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; CHECK-T-NOT: bics
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entry:
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%cmpLow = icmp slt i16 %x, 0
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%saturateLow = select i1 %cmpLow, i16 0, i16 %x
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ret i16 %saturateLow
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}
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; x < 0 ? 0 : x
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; 8-bit base test
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define i8 @sat0_base_8bit(i8 %x) #0 {
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; CHECK-LABEL: sat0_base_8bit:
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; CHECK-CMP: cmp
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; CHECK-ARM-NOT: bic
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; CHECK-T2-NOT: bic.w
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entry:
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%cmpLow = icmp slt i8 %x, 0
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%saturateLow = select i1 %cmpLow, i8 0, i8 %x
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ret i8 %saturateLow
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}
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; Test where the conditional is formed in a different way
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; x > 0 ? x : 0
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define i32 @sat0_lower_1(i32 %x) #0 {
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; CHECK-LABEL: sat0_lower_1:
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; CHECK-CMP-NOT: cmp
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; CHECK-ARM: bic {{r[0-9]}}, [[INPUT:r[0-9]]], [[INPUT]], asr #31
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; CHECK-T2: bic.w {{r[0-9]}}, [[INPUT:r[0-9]]], [[INPUT]], asr #31
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; CHECK-T: asrs [[IM:r[0-9]]], {{r[0-9]}}, #31
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; CHECK-T-NEXT: bics {{r[0-9]}}, [[IM]]
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entry:
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%cmpGt = icmp sgt i32 %x, 0
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%saturateLow = select i1 %cmpGt, i32 %x, i32 0
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ret i32 %saturateLow
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}
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; Check for clipping against -1 that should result in orr
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;
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; Base tests with different bit widths
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;
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; x < -1 ? -1 : x
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; 32-bit base test
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define i32 @sat1_base_32bit(i32 %x) #0 {
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; CHECK-LABEL: sat1_base_32bit:
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; CHECK-CMP-NOT: cmp
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; CHECK-ARM: orr {{r[0-9]}}, [[INPUT:r[0-9]]], [[INPUT]], asr #31
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; CHECK-T2: orr.w {{r[0-9]}}, [[INPUT:r[0-9]]], [[INPUT]], asr #31
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; CHECK-T: asrs [[IM:r[0-9]]], {{r[0-9]}}, #31
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; CHECK-T-NEXT: orrs {{r[0-9]}}, [[IM]]
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entry:
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%cmpLow = icmp slt i32 %x, -1
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%saturateLow = select i1 %cmpLow, i32 -1, i32 %x
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ret i32 %saturateLow
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}
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; x < -1 ? -1 : x
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; 16-bit base test
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define i16 @sat1_base_16bit(i16 %x) #0 {
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; CHECK-LABEL: sat1_base_16bit:
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; CHECK-ARM: cmn
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; CHECK-T2: cmp
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; CHECK-T: cmp
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entry:
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%cmpLow = icmp slt i16 %x, -1
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%saturateLow = select i1 %cmpLow, i16 -1, i16 %x
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ret i16 %saturateLow
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}
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; x < -1 ? -1 : x
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; 8-bit base test
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define i8 @sat1_base_8bit(i8 %x) #0 {
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; CHECK-LABEL: sat1_base_8bit:
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; CHECK-ARM: cmn
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; CHECK-T2: cmp
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; CHECK-T: cmp
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entry:
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%cmpLow = icmp slt i8 %x, -1
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%saturateLow = select i1 %cmpLow, i8 -1, i8 %x
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ret i8 %saturateLow
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}
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; Test where the conditional is formed in a different way
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; x > -1 ? x : -1
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define i32 @sat1_lower_1(i32 %x) #0 {
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; CHECK-LABEL: sat1_lower_1:
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; CHECK-ARM: orr {{r[0-9]}}, [[INPUT:r[0-9]]], [[INPUT]], asr #31
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; CHECK-T2: orr.w {{r[0-9]}}, [[INPUT:r[0-9]]], [[INPUT]], asr #31
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; CHECK-T: asrs [[IM:r[0-9]]], {{r[0-9]}}, #31
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; CHECK-T-NEXT: orrs {{r[0-9]}}, [[IM]]
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; CHECK-CMP-NOT: cmp
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entry:
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%cmpGt = icmp sgt i32 %x, -1
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%saturateLow = select i1 %cmpGt, i32 %x, i32 -1
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ret i32 %saturateLow
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}
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; The following tests for patterns that should not transform into bitops
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; but that are similar enough that could confuse the selector.
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; x < 0 ? 0 : y where x and y does not properly match
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define i32 @no_sat0_incorrect_variable(i32 %x, i32 %y) #0 {
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; CHECK-LABEL: no_sat0_incorrect_variable:
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; CHECK-NOT: bic
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; CHECK-NOT: asrs
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; CHECK-CMP: cmp
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entry:
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%cmpLow = icmp slt i32 %x, 0
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%saturateLow = select i1 %cmpLow, i32 0, i32 %y
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ret i32 %saturateLow
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}
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; x < 0 ? -1 : x
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define i32 @no_sat0_incorrect_constant(i32 %x) #0 {
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; CHECK-LABEL: no_sat0_incorrect_constant:
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; CHECK-NOT: bic
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; CHECK-NOT: asrs
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; CHECK-CMP: cmp
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entry:
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%cmpLow = icmp slt i32 %x, 0
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%saturateLow = select i1 %cmpLow, i32 -1, i32 %x
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ret i32 %saturateLow
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}
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