mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-09-14 20:57:01 +00:00
0541722de4
First, this changes the base-pointer implementation to remove an unnecessary complication (and one that is incompatible with how builtin SjLj is implemented): instead of using r31 as the base pointer when it is not needed as a frame pointer, now the base pointer will always be r30 when needed. Second, we introduce another pseudo register, BP, which is used just like the FP pseudo register to refer to the base register before we know for certain what register it will be. Third, we now save BP into the jmp_buf, and restore r30 from that slot in longjmp. If the function that called setjmp did not use a base pointer, then r30 will be overwritten by the setjmp-calling-function's restore code. FP restoration (which is restored into r31) works the same way. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186545 91177308-0d34-0410-b5e6-96231b3b80d8
160 lines
4.9 KiB
LLVM
160 lines
4.9 KiB
LLVM
; RUN: llc < %s -mtriple=powerpc64-unknown-linux-gnu -mcpu=pwr7 | FileCheck %s
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; RUN: llc < %s -mtriple=powerpc64-unknown-linux-gnu -mcpu=a2 | FileCheck -check-prefix=CHECK-NOAV %s
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target datalayout = "E-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-f128:128:128-v128:128:128-n32:64"
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target triple = "powerpc64-unknown-linux-gnu"
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%struct.__jmp_buf_tag = type { [64 x i64], i32, %struct.__sigset_t, [8 x i8] }
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%struct.__sigset_t = type { [16 x i64] }
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@env_sigill = internal global [1 x %struct.__jmp_buf_tag] zeroinitializer, align 16
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define void @foo() #0 {
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entry:
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call void @llvm.eh.sjlj.longjmp(i8* bitcast ([1 x %struct.__jmp_buf_tag]* @env_sigill to i8*))
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unreachable
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; CHECK: @foo
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; CHECK: addis [[REG:[0-9]+]], 2, env_sigill@toc@ha
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; CHECK: addi [[REG]], [[REG]], env_sigill@toc@l
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; CHECK: ld 31, 0([[REG]])
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; CHECK: ld [[REG2:[0-9]+]], 8([[REG]])
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; CHECK: ld 1, 16([[REG]])
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; CHECK: mtctr [[REG2]]
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; CHECK: ld 30, 32([[REG]])
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; CHECK: ld 2, 24([[REG]])
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; CHECK: bctr
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return: ; No predecessors!
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ret void
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}
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declare void @llvm.eh.sjlj.longjmp(i8*) #1
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define signext i32 @main() #0 {
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entry:
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%retval = alloca i32, align 4
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store i32 0, i32* %retval
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%0 = call i8* @llvm.frameaddress(i32 0)
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store i8* %0, i8** bitcast ([1 x %struct.__jmp_buf_tag]* @env_sigill to i8**)
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%1 = call i8* @llvm.stacksave()
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store i8* %1, i8** getelementptr (i8** bitcast ([1 x %struct.__jmp_buf_tag]* @env_sigill to i8**), i32 2)
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%2 = call i32 @llvm.eh.sjlj.setjmp(i8* bitcast ([1 x %struct.__jmp_buf_tag]* @env_sigill to i8*))
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%tobool = icmp ne i32 %2, 0
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br i1 %tobool, label %if.then, label %if.else
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if.then: ; preds = %entry
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store i32 1, i32* %retval
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br label %return
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if.else: ; preds = %entry
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call void @foo()
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br label %if.end
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if.end: ; preds = %if.else
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store i32 0, i32* %retval
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br label %return
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return: ; preds = %if.end, %if.then
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%3 = load i32* %retval
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ret i32 %3
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; FIXME: We should be saving VRSAVE on Darwin, but we're not!
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; CHECK: @main
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; CHECK: std
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; Make sure that we're not saving VRSAVE on non-Darwin:
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; CHECK-NOT: mfspr
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; CHECK: stfd
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; CHECK: stvx
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; CHECK: addis [[REG:[0-9]+]], 2, env_sigill@toc@ha
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; CHECK: std 31, env_sigill@toc@l([[REG]])
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; CHECK: addi [[REG]], [[REG]], env_sigill@toc@l
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; CHECK: std [[REG]], [[OFF:[0-9]+]](31) # 8-byte Folded Spill
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; CHECK: std 1, 16([[REG]])
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; CHECK: std 2, 24([[REG]])
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; CHECK: bcl 20, 31, .LBB1_1
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; CHECK: li 3, 1
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; CHECK: #EH_SjLj_Setup .LBB1_1
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; CHECK: b .LBB1_2
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; CHECK: .LBB1_1:
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; CHECK: mflr [[REGL:[0-9]+]]
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; CHECK: ld [[REG2:[0-9]+]], [[OFF]](31) # 8-byte Folded Reload
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; CHECK: std [[REGL]], 8([[REG2]])
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; CHECK: li 3, 0
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; CHECK: .LBB1_2:
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; CHECK: lfd
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; CHECK: lvx
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; CHECK: ld
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; CHECK: blr
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; CHECK-NOAV: @main
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; CHECK-NOAV-NOT: stvx
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; CHECK-NOAV: bcl
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; CHECK-NOAV: mflr
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; CHECK-NOAV: bl foo
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; CHECK-NOAV-NOT: lvx
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; CHECK-NOAV: blr
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}
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define signext i32 @main2() #0 {
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entry:
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%a = alloca i8, align 64
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call void @bar(i8* %a)
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%retval = alloca i32, align 4
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store i32 0, i32* %retval
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%0 = call i8* @llvm.frameaddress(i32 0)
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store i8* %0, i8** bitcast ([1 x %struct.__jmp_buf_tag]* @env_sigill to i8**)
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%1 = call i8* @llvm.stacksave()
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store i8* %1, i8** getelementptr (i8** bitcast ([1 x %struct.__jmp_buf_tag]* @env_sigill to i8**), i32 2)
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%2 = call i32 @llvm.eh.sjlj.setjmp(i8* bitcast ([1 x %struct.__jmp_buf_tag]* @env_sigill to i8*))
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%tobool = icmp ne i32 %2, 0
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br i1 %tobool, label %if.then, label %if.else
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if.then: ; preds = %entry
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store i32 1, i32* %retval
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br label %return
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if.else: ; preds = %entry
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call void @foo()
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br label %if.end
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if.end: ; preds = %if.else
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store i32 0, i32* %retval
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br label %return
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return: ; preds = %if.end, %if.then
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%3 = load i32* %retval
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ret i32 %3
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; CHECK: @main2
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; CHECK: addis [[REG:[0-9]+]], 2, env_sigill@toc@ha
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; CHECK: std 31, env_sigill@toc@l([[REG]])
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; CHECK: addi [[REG]], [[REG]], env_sigill@toc@l
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; CHECK: std [[REG]], [[OFF:[0-9]+]](31) # 8-byte Folded Spill
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; CHECK: std 1, 16([[REG]])
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; CHECK: std 2, 24([[REG]])
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; CHECK: std 30, 32([[REG]])
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; CHECK: bcl 20, 31,
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; CHECK: blr
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}
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declare void @bar(i8*) #3
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declare i8* @llvm.frameaddress(i32) #2
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declare i8* @llvm.stacksave() #3
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declare i32 @llvm.eh.sjlj.setjmp(i8*) #3
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attributes #0 = { nounwind "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-frame-pointer-elim-non-leaf"="true" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #1 = { noreturn nounwind }
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attributes #2 = { nounwind readnone }
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attributes #3 = { nounwind }
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