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[FastISel][AArch64] Don't perform sign-/zero-extension for function arguments that have already been sign-/zero-extended.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214844 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Juergen Ributzka 2014-08-05 05:43:44 +00:00
parent d047a9df7d
commit 7e9c0bc511
2 changed files with 67 additions and 48 deletions
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26
lib/Target/AArch64/AArch64FastISel.cpp
View File

@ -2335,9 +2335,31 @@ bool AArch64FastISel::SelectIntExt(const Instruction *I) {
MVT SrcVT = SrcEVT.getSimpleVT();
MVT DestVT = DestEVT.getSimpleVT();
unsigned ResultReg = EmitIntExt(SrcVT, SrcReg, DestVT, isZExt);
if (ResultReg == 0)
unsigned ResultReg = 0;
// Check if it is an argument and if it is already zero/sign-extended.
if (const auto *Arg = dyn_cast<Argument>(Src)) {
if ((isZExt && Arg->hasZExtAttr()) || (!isZExt && Arg->hasSExtAttr())) {
ResultReg = createResultReg(TLI.getRegClassFor(DestVT));
if (DestVT == MVT::i64)
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
TII.get(AArch64::SUBREG_TO_REG), ResultReg)
.addImm(0)
.addReg(SrcReg)
.addImm(AArch64::sub_32);
else
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
TII.get(TargetOpcode::COPY), ResultReg)
.addReg(SrcReg);
}
}
if (!ResultReg)
ResultReg = EmitIntExt(SrcVT, SrcReg, DestVT, isZExt);
if (!ResultReg)
return false;
UpdateValueMap(I, ResultReg);
return true;
}

89
test/CodeGen/AArch64/arm64-fast-isel-conversion.ll
View File

@ -3,7 +3,7 @@
;; Test various conversions.
define zeroext i32 @trunc_(i8 zeroext %a, i16 zeroext %b, i32 %c, i64 %d) nounwind ssp {
entry:
; CHECK: trunc_
; CHECK-LABEL: trunc_
; CHECK: sub sp, sp, #16
; CHECK: strb w0, [sp, #15]
; CHECK: strh w1, [sp, #12]
@ -44,7 +44,7 @@ entry:
define i64 @zext_(i8 zeroext %a, i16 zeroext %b, i32 %c, i64 %d) nounwind ssp {
entry:
; CHECK: zext_
; CHECK-LABEL: zext_
; CHECK: sub sp, sp, #16
; CHECK: strb w0, [sp, #15]
; CHECK: strh w1, [sp, #12]
@ -85,23 +85,25 @@ entry:
define i32 @zext_i1_i32(i1 zeroext %a) nounwind ssp {
entry:
; CHECK: @zext_i1_i32
; CHECK: and w0, w0, #0x1
; CHECK-LABEL: zext_i1_i32
; CHECK-NOT: and w0, w0, #0x1
; CHECK: ret
%conv = zext i1 %a to i32
ret i32 %conv;
}
define i64 @zext_i1_i64(i1 zeroext %a) nounwind ssp {
entry:
; CHECK: @zext_i1_i64
; CHECK: and w0, w0, #0x1
; CHECK-LABEL: zext_i1_i64
; CHECK-NOT: and w0, w0, #0x1
; CHECK: ret
%conv = zext i1 %a to i64
ret i64 %conv;
}
define i64 @sext_(i8 signext %a, i16 signext %b, i32 %c, i64 %d) nounwind ssp {
entry:
; CHECK: sext_
; CHECK-LABEL: sext_
; CHECK: sub sp, sp, #16
; CHECK: strb w0, [sp, #15]
; CHECK: strh w1, [sp, #12]
@ -161,8 +163,9 @@ define zeroext i64 @sext_i16_i64(i16 zeroext %in) {
; Test sext i1 to i32
define i32 @sext_i1_i32(i1 signext %a) nounwind ssp {
entry:
; CHECK: sext_i1_i32
; CHECK: sbfx w0, w0, #0, #1
; CHECK-LABEL: sext_i1_i32
; CHECK-NOT: sbfx w0, w0, #0, #1
; CHECK: ret
%conv = sext i1 %a to i32
ret i32 %conv
}
@ -170,7 +173,7 @@ entry:
; Test sext i1 to i16
define signext i16 @sext_i1_i16(i1 %a) nounwind ssp {
entry:
; CHECK: sext_i1_i16
; CHECK-LABEL: sext_i1_i16
; CHECK: sbfx w0, w0, #0, #1
%conv = sext i1 %a to i16
ret i16 %conv
@ -179,7 +182,7 @@ entry:
; Test sext i1 to i8
define signext i8 @sext_i1_i8(i1 %a) nounwind ssp {
entry:
; CHECK: sext_i1_i8
; CHECK-LABEL: sext_i1_i8
; CHECK: sbfx w0, w0, #0, #1
%conv = sext i1 %a to i8
ret i8 %conv
@ -188,7 +191,7 @@ entry:
; Test fpext
define double @fpext_(float %a) nounwind ssp {
entry:
; CHECK: fpext_
; CHECK-LABEL: fpext_
; CHECK: fcvt d0, s0
%conv = fpext float %a to double
ret double %conv
@ -197,7 +200,7 @@ entry:
; Test fptrunc
define float @fptrunc_(double %a) nounwind ssp {
entry:
; CHECK: fptrunc_
; CHECK-LABEL: fptrunc_
; CHECK: fcvt s0, d0
%conv = fptrunc double %a to float
ret float %conv
@ -206,7 +209,7 @@ entry:
; Test fptosi
define i32 @fptosi_ws(float %a) nounwind ssp {
entry:
; CHECK: fptosi_ws
; CHECK-LABEL: fptosi_ws
; CHECK: fcvtzs w0, s0
%conv = fptosi float %a to i32
ret i32 %conv
@ -215,7 +218,7 @@ entry:
; Test fptosi
define i32 @fptosi_wd(double %a) nounwind ssp {
entry:
; CHECK: fptosi_wd
; CHECK-LABEL: fptosi_wd
; CHECK: fcvtzs w0, d0
%conv = fptosi double %a to i32
ret i32 %conv
@ -224,7 +227,7 @@ entry:
; Test fptoui
define i32 @fptoui_ws(float %a) nounwind ssp {
entry:
; CHECK: fptoui_ws
; CHECK-LABEL: fptoui_ws
; CHECK: fcvtzu w0, s0
%conv = fptoui float %a to i32
ret i32 %conv
@ -233,7 +236,7 @@ entry:
; Test fptoui
define i32 @fptoui_wd(double %a) nounwind ssp {
entry:
; CHECK: fptoui_wd
; CHECK-LABEL: fptoui_wd
; CHECK: fcvtzu w0, d0
%conv = fptoui double %a to i32
ret i32 %conv
@ -242,7 +245,7 @@ entry:
; Test sitofp
define float @sitofp_sw_i1(i1 %a) nounwind ssp {
entry:
; CHECK: sitofp_sw_i1
; CHECK-LABEL: sitofp_sw_i1
; CHECK: sbfx w0, w0, #0, #1
; CHECK: scvtf s0, w0
%conv = sitofp i1 %a to float
@ -252,7 +255,7 @@ entry:
; Test sitofp
define float @sitofp_sw_i8(i8 %a) nounwind ssp {
entry:
; CHECK: sitofp_sw_i8
; CHECK-LABEL: sitofp_sw_i8
; CHECK: sxtb w0, w0
; CHECK: scvtf s0, w0
%conv = sitofp i8 %a to float
@ -262,9 +265,7 @@ entry:
; Test sitofp
define float @sitofp_sw_i16(i16 %a) nounwind ssp {
entry:
; CHECK: sitofp_sw_i16
; CHECK: sxth w0, w0
; CHECK: scvtf s0, w0
; CHECK-LABEL: sitofp_sw_i16
%conv = sitofp i16 %a to float
ret float %conv
}
@ -272,7 +273,7 @@ entry:
; Test sitofp
define float @sitofp_sw(i32 %a) nounwind ssp {
entry:
; CHECK: sitofp_sw
; CHECK-LABEL: sitofp_sw
; CHECK: scvtf s0, w0
%conv = sitofp i32 %a to float
ret float %conv
@ -281,7 +282,7 @@ entry:
; Test sitofp
define float @sitofp_sx(i64 %a) nounwind ssp {
entry:
; CHECK: sitofp_sx
; CHECK-LABEL: sitofp_sx
; CHECK: scvtf s0, x0
%conv = sitofp i64 %a to float
ret float %conv
@ -290,7 +291,7 @@ entry:
; Test sitofp
define double @sitofp_dw(i32 %a) nounwind ssp {
entry:
; CHECK: sitofp_dw
; CHECK-LABEL: sitofp_dw
; CHECK: scvtf d0, w0
%conv = sitofp i32 %a to double
ret double %conv
@ -299,7 +300,7 @@ entry:
; Test sitofp
define double @sitofp_dx(i64 %a) nounwind ssp {
entry:
; CHECK: sitofp_dx
; CHECK-LABEL: sitofp_dx
; CHECK: scvtf d0, x0
%conv = sitofp i64 %a to double
ret double %conv
@ -308,7 +309,7 @@ entry:
; Test uitofp
define float @uitofp_sw_i1(i1 %a) nounwind ssp {
entry:
; CHECK: uitofp_sw_i1
; CHECK-LABEL: uitofp_sw_i1
; CHECK: and w0, w0, #0x1
; CHECK: ucvtf s0, w0
%conv = uitofp i1 %a to float
@ -318,9 +319,7 @@ entry:
; Test uitofp
define float @uitofp_sw_i8(i8 %a) nounwind ssp {
entry:
; CHECK: uitofp_sw_i8
; CHECK: uxtb w0, w0
; CHECK: ucvtf s0, w0
; CHECK-LABEL: uitofp_sw_i8
%conv = uitofp i8 %a to float
ret float %conv
}
@ -328,9 +327,7 @@ entry:
; Test uitofp
define float @uitofp_sw_i16(i16 %a) nounwind ssp {
entry:
; CHECK: uitofp_sw_i16
; CHECK: uxth w0, w0
; CHECK: ucvtf s0, w0
; CHECK-LABEL: uitofp_sw_i16
%conv = uitofp i16 %a to float
ret float %conv
}
@ -338,7 +335,7 @@ entry:
; Test uitofp
define float @uitofp_sw(i32 %a) nounwind ssp {
entry:
; CHECK: uitofp_sw
; CHECK-LABEL: uitofp_sw
; CHECK: ucvtf s0, w0
%conv = uitofp i32 %a to float
ret float %conv
@ -347,7 +344,7 @@ entry:
; Test uitofp
define float @uitofp_sx(i64 %a) nounwind ssp {
entry:
; CHECK: uitofp_sx
; CHECK-LABEL: uitofp_sx
; CHECK: ucvtf s0, x0
%conv = uitofp i64 %a to float
ret float %conv
@ -356,7 +353,7 @@ entry:
; Test uitofp
define double @uitofp_dw(i32 %a) nounwind ssp {
entry:
; CHECK: uitofp_dw
; CHECK-LABEL: uitofp_dw
; CHECK: ucvtf d0, w0
%conv = uitofp i32 %a to double
ret double %conv
@ -365,7 +362,7 @@ entry:
; Test uitofp
define double @uitofp_dx(i64 %a) nounwind ssp {
entry:
; CHECK: uitofp_dx
; CHECK-LABEL: uitofp_dx
; CHECK: ucvtf d0, x0
%conv = uitofp i64 %a to double
ret double %conv
@ -373,7 +370,7 @@ entry:
define i32 @i64_trunc_i32(i64 %a) nounwind ssp {
entry:
; CHECK: i64_trunc_i32
; CHECK-LABEL: i64_trunc_i32
; CHECK: mov x1, x0
%conv = trunc i64 %a to i32
ret i32 %conv
@ -381,7 +378,7 @@ entry:
define zeroext i16 @i64_trunc_i16(i64 %a) nounwind ssp {
entry:
; CHECK: i64_trunc_i16
; CHECK-LABEL: i64_trunc_i16
; CHECK: mov x[[REG:[0-9]+]], x0
; CHECK: and [[REG2:w[0-9]+]], w[[REG]], #0xffff
; CHECK: uxth w0, [[REG2]]
@ -391,7 +388,7 @@ entry:
define zeroext i8 @i64_trunc_i8(i64 %a) nounwind ssp {
entry:
; CHECK: i64_trunc_i8
; CHECK-LABEL: i64_trunc_i8
; CHECK: mov x[[REG:[0-9]+]], x0
; CHECK: and [[REG2:w[0-9]+]], w[[REG]], #0xff
; CHECK: uxtb w0, [[REG2]]
@ -401,7 +398,7 @@ entry:
define zeroext i1 @i64_trunc_i1(i64 %a) nounwind ssp {
entry:
; CHECK: i64_trunc_i1
; CHECK-LABEL: i64_trunc_i1
; CHECK: mov x[[REG:[0-9]+]], x0
; CHECK: and [[REG2:w[0-9]+]], w[[REG]], #0x1
; CHECK: and w0, [[REG2]], #0x1
@ -411,7 +408,7 @@ entry:
; rdar://15101939
define void @stack_trunc() nounwind {
; CHECK: stack_trunc
; CHECK-LABEL: stack_trunc
; CHECK: sub sp, sp, #16
; CHECK: ldr [[REG:x[0-9]+]], [sp]
; CHECK: mov x[[REG2:[0-9]+]], [[REG]]
@ -428,15 +425,15 @@ define void @stack_trunc() nounwind {
define zeroext i64 @zext_i8_i64(i8 zeroext %in) {
; CHECK-LABEL: zext_i8_i64:
; CHECK: mov x[[TMP:[0-9]+]], x0
; CHECK: ubfx x0, x[[TMP]], #0, #8
; CHECK-NOT: ubfx x0, {{x[0-9]+}}, #0, #8
; CHECK: ret
%big = zext i8 %in to i64
ret i64 %big
}
define zeroext i64 @zext_i16_i64(i16 zeroext %in) {
; CHECK-LABEL: zext_i16_i64:
; CHECK: mov x[[TMP:[0-9]+]], x0
; CHECK: ubfx x0, x[[TMP]], #0, #16
; CHECK-NOT: ubfx x0, {{x[0-9]+}}, #0, #16
; CHECK: ret
%big = zext i16 %in to i64
ret i64 %big
}