fp-strict-cmp-04.ll
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; Test that floating-point strict compares are omitted if CC already has the
; right value.
;
; RUN: llc < %s -mtriple=s390x-linux-gnu -mcpu=z10 \
; RUN: -enable-misched=0 -no-integrated-as | FileCheck %s
;
; We need -enable-misched=0 to make sure f12 and following routines really
; test the compare elimination pass.
declare float @llvm.fabs.f32(float %f)
; Test addition followed by EQ, which can use the CC result of the addition.
define float @f1(float %a, float %b, float *%dest) #0 {
; CHECK-LABEL: f1:
; CHECK: aebr %f0, %f2
; CHECK-NEXT: ber %r14
; CHECK: br %r14
entry:
%res = call float @llvm.experimental.constrained.fadd.f32(
float %a, float %b,
metadata !"round.dynamic",
metadata !"fpexcept.strict") #0
%cmp = call i1 @llvm.experimental.constrained.fcmp.f32(
float %res, float 0.0,
metadata !"oeq",
metadata !"fpexcept.strict") #0
br i1 %cmp, label %exit, label %store
store:
store float %b, float *%dest
br label %exit
exit:
ret float %res
}
; ...and again with LT.
define float @f2(float %a, float %b, float *%dest) #0 {
; CHECK-LABEL: f2:
; CHECK: aebr %f0, %f2
; CHECK-NEXT: blr %r14
; CHECK: br %r14
entry:
%res = call float @llvm.experimental.constrained.fadd.f32(
float %a, float %b,
metadata !"round.dynamic",
metadata !"fpexcept.strict") #0
%cmp = call i1 @llvm.experimental.constrained.fcmp.f32(
float %res, float 0.0,
metadata !"olt",
metadata !"fpexcept.strict") #0
br i1 %cmp, label %exit, label %store
store:
store float %b, float *%dest
br label %exit
exit:
ret float %res
}
; ...and again with GT.
define float @f3(float %a, float %b, float *%dest) #0 {
; CHECK-LABEL: f3:
; CHECK: aebr %f0, %f2
; CHECK-NEXT: bhr %r14
; CHECK: br %r14
entry:
%res = call float @llvm.experimental.constrained.fadd.f32(
float %a, float %b,
metadata !"round.dynamic",
metadata !"fpexcept.strict") #0
%cmp = call i1 @llvm.experimental.constrained.fcmp.f32(
float %res, float 0.0,
metadata !"ogt",
metadata !"fpexcept.strict") #0
br i1 %cmp, label %exit, label %store
store:
store float %b, float *%dest
br label %exit
exit:
ret float %res
}
; ...and again with UEQ.
define float @f4(float %a, float %b, float *%dest) #0 {
; CHECK-LABEL: f4:
; CHECK: aebr %f0, %f2
; CHECK-NEXT: bnlhr %r14
; CHECK: br %r14
entry:
%res = call float @llvm.experimental.constrained.fadd.f32(
float %a, float %b,
metadata !"round.dynamic",
metadata !"fpexcept.strict") #0
%cmp = call i1 @llvm.experimental.constrained.fcmp.f32(
float %res, float 0.0,
metadata !"ueq",
metadata !"fpexcept.strict") #0
br i1 %cmp, label %exit, label %store
store:
store float %b, float *%dest
br label %exit
exit:
ret float %res
}
; Subtraction also provides a zero-based CC value.
define float @f5(float %a, float %b, float *%dest) {
; CHECK-LABEL: f5:
; CHECK: seb %f0, 0(%r2)
; CHECK-NEXT: bnher %r14
; CHECK: br %r14
entry:
%cur = load float, float *%dest
%res = call float @llvm.experimental.constrained.fsub.f32(
float %a, float %cur,
metadata !"round.dynamic",
metadata !"fpexcept.strict") #0
%cmp = call i1 @llvm.experimental.constrained.fcmp.f32(
float %res, float 0.0,
metadata !"ult",
metadata !"fpexcept.strict") #0
br i1 %cmp, label %exit, label %store
store:
store float %b, float *%dest
br label %exit
exit:
ret float %res
}
; Test the result of LOAD POSITIVE. We cannot omit the LTEBR.
define float @f6(float %dummy, float %a, float *%dest) #0 {
; CHECK-LABEL: f6:
; CHECK: lpdfr %f0, %f2
; CHECK-NEXT: ltebr %f0, %f0
; CHECK-NEXT: bhr %r14
; CHECK: br %r14
entry:
%res = call float @llvm.fabs.f32(float %a)
%cmp = call i1 @llvm.experimental.constrained.fcmp.f32(
float %res, float 0.0,
metadata !"ogt",
metadata !"fpexcept.strict") #0
br i1 %cmp, label %exit, label %store
store:
store float %res, float *%dest
br label %exit
exit:
ret float %res
}
; Test the result of LOAD NEGATIVE. We cannot omit the LTEBR.
define float @f7(float %dummy, float %a, float *%dest) #0 {
; CHECK-LABEL: f7:
; CHECK: lndfr %f0, %f2
; CHECK-NEXT: ltebr %f0, %f0
; CHECK-NEXT: blr %r14
; CHECK: br %r14
entry:
%abs = call float @llvm.fabs.f32(float %a)
%res = fneg float %abs
%cmp = call i1 @llvm.experimental.constrained.fcmp.f32(
float %res, float 0.0,
metadata !"olt",
metadata !"fpexcept.strict") #0
br i1 %cmp, label %exit, label %store
store:
store float %res, float *%dest
br label %exit
exit:
ret float %res
}
; Test the result of LOAD COMPLEMENT. We cannot omit the LTEBR.
define float @f8(float %dummy, float %a, float *%dest) #0 {
; CHECK-LABEL: f8:
; CHECK: lcdfr %f0, %f2
; CHECK-NEXT: ltebr %f0, %f0
; CHECK-NEXT: bler %r14
; CHECK: br %r14
entry:
%res = fneg float %a
%cmp = call i1 @llvm.experimental.constrained.fcmp.f32(
float %res, float 0.0,
metadata !"ole",
metadata !"fpexcept.strict") #0
br i1 %cmp, label %exit, label %store
store:
store float %res, float *%dest
br label %exit
exit:
ret float %res
}
; Multiplication (for example) does not modify CC.
define float @f9(float %a, float %b, float *%dest) #0 {
; CHECK-LABEL: f9:
; CHECK: meebr %f0, %f2
; CHECK-NEXT: ltebr %f0, %f0
; CHECK-NEXT: blhr %r14
; CHECK: br %r14
entry:
%res = call float @llvm.experimental.constrained.fmul.f32(
float %a, float %b,
metadata !"round.dynamic",
metadata !"fpexcept.strict") #0
%cmp = call i1 @llvm.experimental.constrained.fcmp.f32(
float %res, float 0.0,
metadata !"one",
metadata !"fpexcept.strict") #0
br i1 %cmp, label %exit, label %store
store:
store float %b, float *%dest
br label %exit
exit:
ret float %res
}
; Test a combination involving a CC-setting instruction followed by
; a non-CC-setting instruction.
define float @f10(float %a, float %b, float %c, float *%dest) #0 {
; CHECK-LABEL: f10:
; CHECK: aebr %f0, %f2
; CHECK-NEXT: debr %f0, %f4
; CHECK-NEXT: ltebr %f0, %f0
; CHECK-NEXT: bner %r14
; CHECK: br %r14
entry:
%add = call float @llvm.experimental.constrained.fadd.f32(
float %a, float %b,
metadata !"round.dynamic",
metadata !"fpexcept.strict") #0
%res = call float @llvm.experimental.constrained.fdiv.f32(
float %add, float %c,
metadata !"round.dynamic",
metadata !"fpexcept.strict") #0
%cmp = call i1 @llvm.experimental.constrained.fcmp.f32(
float %res, float 0.0,
metadata !"une",
metadata !"fpexcept.strict") #0
br i1 %cmp, label %exit, label %store
store:
store float %b, float *%dest
br label %exit
exit:
ret float %res
}
; Test a case where CC is set based on a different register from the
; compare input.
define float @f11(float %a, float %b, float %c, float *%dest1, float *%dest2) #0 {
; CHECK-LABEL: f11:
; CHECK: aebr %f0, %f2
; CHECK-NEXT: sebr %f4, %f0
; CHECK-DAG: ste %f4, 0(%r2)
; CHECK-DAG: ltebr %f0, %f0
; CHECK-NEXT: ber %r14
; CHECK: br %r14
entry:
%add = call float @llvm.experimental.constrained.fadd.f32(
float %a, float %b,
metadata !"round.dynamic",
metadata !"fpexcept.strict") #0
%sub = call float @llvm.experimental.constrained.fsub.f32(
float %c, float %add,
metadata !"round.dynamic",
metadata !"fpexcept.strict") #0
store float %sub, float *%dest1
%cmp = call i1 @llvm.experimental.constrained.fcmp.f32(
float %add, float 0.0,
metadata !"oeq",
metadata !"fpexcept.strict") #0
br i1 %cmp, label %exit, label %store
store:
store float %sub, float *%dest2
br label %exit
exit:
ret float %add
}
; Test that LER gets converted to LTEBR where useful.
define float @f12(float %dummy, float %val) #0 {
; CHECK-LABEL: f12:
; CHECK: ltebr %f0, %f2
; CHECK-NEXT: #APP
; CHECK-NEXT: blah %f0
; CHECK-NEXT: #NO_APP
; CHECK-NEXT: blr %r14
; CHECK: br %r14
entry:
%ret = call float asm "blah $1", "=f,{f0}"(float %val)
%cmp = call i1 @llvm.experimental.constrained.fcmp.f32(
float %val, float 0.0,
metadata !"olt",
metadata !"fpexcept.strict") #0
br i1 %cmp, label %exit, label %store
store:
call void asm sideeffect "blah", ""()
br label %exit
exit:
ret float %ret
}
; Test that LDR gets converted to LTDBR where useful.
define double @f13(double %dummy, double %val) #0 {
; CHECK-LABEL: f13:
; CHECK: ltdbr %f0, %f2
; CHECK-NEXT: #APP
; CHECK-NEXT: blah %f0
; CHECK-NEXT: #NO_APP
; CHECK-NEXT: blr %r14
; CHECK: br %r14
entry:
%ret = call double asm "blah $1", "=f,{f0}"(double %val)
%cmp = call i1 @llvm.experimental.constrained.fcmp.f64(
double %val, double 0.0,
metadata !"olt",
metadata !"fpexcept.strict") #0
br i1 %cmp, label %exit, label %store
store:
call void asm sideeffect "blah", ""()
br label %exit
exit:
ret double %ret
}
; Test that LXR gets converted to LTXBR where useful.
define void @f14(fp128 *%ptr1, fp128 *%ptr2) #0 {
; CHECK-LABEL: f14:
; CHECK: ltxbr
; CHECK-NEXT: dxbr
; CHECK-NEXT: std
; CHECK-NEXT: std
; CHECK-NEXT: mxbr
; CHECK-NEXT: std
; CHECK-NEXT: std
; CHECK-NEXT: blr %r14
; CHECK: br %r14
entry:
%val1 = load fp128, fp128 *%ptr1
%val2 = load fp128, fp128 *%ptr2
%div = fdiv fp128 %val1, %val2
store fp128 %div, fp128 *%ptr1
%mul = fmul fp128 %val1, %val2
store fp128 %mul, fp128 *%ptr2
%cmp = call i1 @llvm.experimental.constrained.fcmp.f128(
fp128 %val1, fp128 0xL00000000000000000000000000000000,
metadata !"olt",
metadata !"fpexcept.strict") #0
br i1 %cmp, label %exit, label %store
store:
call void asm sideeffect "blah", ""()
br label %exit
exit:
ret void
}
; Test a case where it is the source rather than destination of LER that
; we need.
define float @f15(float %val, float %dummy) #0 {
; CHECK-LABEL: f15:
; CHECK: ltebr %f2, %f0
; CHECK-NEXT: #APP
; CHECK-NEXT: blah %f2
; CHECK-NEXT: #NO_APP
; CHECK-NEXT: blr %r14
; CHECK: br %r14
entry:
%ret = call float asm "blah $1", "=f,{f2}"(float %val)
%cmp = call i1 @llvm.experimental.constrained.fcmp.f32(
float %val, float 0.0,
metadata !"olt",
metadata !"fpexcept.strict") #0
br i1 %cmp, label %exit, label %store
store:
call void asm sideeffect "blah", ""()
br label %exit
exit:
ret float %ret
}
; Test a case where it is the source rather than destination of LDR that
; we need.
define double @f16(double %val, double %dummy) #0 {
; CHECK-LABEL: f16:
; CHECK: ltdbr %f2, %f0
; CHECK-NEXT: #APP
; CHECK-NEXT: blah %f2
; CHECK-NEXT: #NO_APP
; CHECK-NEXT: blr %r14
; CHECK: br %r14
entry:
%ret = call double asm "blah $1", "=f,{f2}"(double %val)
%cmp = call i1 @llvm.experimental.constrained.fcmp.f64(
double %val, double 0.0,
metadata !"olt",
metadata !"fpexcept.strict") #0
br i1 %cmp, label %exit, label %store
store:
call void asm sideeffect "blah", ""()
br label %exit
exit:
ret double %ret
}
; Repeat f2 with a comparison against -0.
define float @f17(float %a, float %b, float *%dest) #0 {
; CHECK-LABEL: f17:
; CHECK: aebr %f0, %f2
; CHECK-NEXT: blr %r14
; CHECK: br %r14
entry:
%res = call float @llvm.experimental.constrained.fadd.f32(
float %a, float %b,
metadata !"round.dynamic",
metadata !"fpexcept.strict") #0
%cmp = call i1 @llvm.experimental.constrained.fcmp.f32(
float %res, float -0.0,
metadata !"olt",
metadata !"fpexcept.strict") #0
br i1 %cmp, label %exit, label %store
store:
store float %b, float *%dest
br label %exit
exit:
ret float %res
}
; Verify that we cannot omit the compare if there may be an intervening
; change to the exception flags.
define float @f18(float %a, float %b, float *%dest) #0 {
; CHECK-LABEL: f18:
; CHECK: aebr %f0, %f2
; CHECK: ltebr %f0, %f0
; CHECK-NEXT: ber %r14
; CHECK: br %r14
entry:
%res = call float @llvm.experimental.constrained.fadd.f32(
float %a, float %b,
metadata !"round.dynamic",
metadata !"fpexcept.strict") #0
call void asm sideeffect "blah", ""()
%cmp = call i1 @llvm.experimental.constrained.fcmp.f32(
float %res, float 0.0,
metadata !"oeq",
metadata !"fpexcept.strict") #0
br i1 %cmp, label %exit, label %store
store:
store float %b, float *%dest
br label %exit
exit:
ret float %res
}
; Verify that we cannot convert LER to LTEBR and omit the compare if
; there may be an intervening change to the exception flags.
define float @f19(float %dummy, float %val) #0 {
; CHECK-LABEL: f19:
; CHECK: ler %f0, %f2
; CHECK-NEXT: #APP
; CHECK-NEXT: blah %f0
; CHECK-NEXT: #NO_APP
; CHECK-NEXT: ltebr %f2, %f2
; CHECK-NEXT: blr %r14
; CHECK: br %r14
entry:
%ret = call float asm sideeffect "blah $1", "=f,{f0}"(float %val)
%cmp = call i1 @llvm.experimental.constrained.fcmp.f32(
float %val, float 0.0,
metadata !"olt",
metadata !"fpexcept.strict") #0
br i1 %cmp, label %exit, label %store
store:
call void asm sideeffect "blah", ""()
br label %exit
exit:
ret float %ret
}
attributes #0 = { strictfp }
declare float @llvm.experimental.constrained.fadd.f32(float, float, metadata, metadata)
declare float @llvm.experimental.constrained.fsub.f32(float, float, metadata, metadata)
declare float @llvm.experimental.constrained.fmul.f32(float, float, metadata, metadata)
declare float @llvm.experimental.constrained.fdiv.f32(float, float, metadata, metadata)
declare i1 @llvm.experimental.constrained.fcmp.f32(float, float, metadata, metadata)
declare i1 @llvm.experimental.constrained.fcmp.f64(double, double, metadata, metadata)
declare i1 @llvm.experimental.constrained.fcmp.f128(fp128, fp128, metadata, metadata)