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Daniel Sanders e2a16fdce2 Re-commit: [mips][fastisel] Handle 0-4 arguments without SelectionDAG.
Summary:
Implements fastLowerArguments() to avoid the need to fall back on
SelectionDAG for 0-4 argument functions that don't do tricky things like
passing double in a pair of i32's.

This allows us to move all except one test to -fast-isel-abort=3. The
remaining one has function prototypes of the form 'i32 (i32, double, double)'
which requires floats to be passed in GPR's.

The previous commit had an uninitialized variable that caused the incoming
argument region to have undefined size. This has been fixed.

Reviewers: sdardis

Subscribers: dsanders, llvm-commits, sdardis

Differential Revision: https://reviews.llvm.org/D22680


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@277136 91177308-0d34-0410-b5e6-96231b3b80d8
2016-07-29 12:27:28 +00:00

35 lines
1.2 KiB
LLVM

; RUN: llc -march=mipsel -relocation-model=pic -O0 -fast-isel-abort=3 -mcpu=mips32r2 \
; RUN: < %s | FileCheck %s
; RUN: llc -march=mipsel -relocation-model=pic -O0 -fast-isel-abort=3 -mcpu=mips32 \
; RUN: < %s | FileCheck %s
@b = global i32 1, align 4
@i = global i32 0, align 4
@.str = private unnamed_addr constant [5 x i8] c"%i \0A\00", align 1
; Function Attrs: nounwind
define void @br() #0 {
entry:
%0 = load i32, i32* @b, align 4
%tobool = icmp eq i32 %0, 0
br i1 %tobool, label %if.end, label %if.then
if.then: ; preds = %entry
store i32 6754, i32* @i, align 4
br label %if.end
if.end: ; preds = %entry, %if.then
ret void
; FIXME: This instruction is redundant.
; CHECK: xor $[[REG1:[0-9]+]], ${{[0-9]+}}, $zero
; CHECK: sltiu $[[REG2:[0-9]+]], $[[REG1]], 1
; CHECK: bgtz $[[REG2]], $BB[[BL:[0-9]+_[0-9]+]]
; CHECK: nop
; CHECK: addiu ${{[0-9]+}}, $zero, 6754
; CHECK: sw ${{[0-9]+}}, 0(${{[0-9]+}})
; CHECK: $BB[[BL]]:
}
attributes #0 = { nounwind "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }