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cf739e729e
If we would allow register coalescing on PTRDISPREGS class then register allocator can lock Z register to some virtual register. Larger instructions requiring a memory acces then fail during the register allocation phase since there is no available register to hold a pointer if Y register was already taken for a stack frame. This patch prevents it by keeping Z register spillable. It does it by not allowing coalescer to lock it. Original discussion on https://github.com/avr-rust/rust/issues/128. llvm-svn: 362298
131 lines
4.2 KiB
LLVM
131 lines
4.2 KiB
LLVM
; RUN: llc -mattr=avr6,sram < %s -march=avr | FileCheck %s
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define void @store8(i8* %x, i8 %y) {
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; CHECK-LABEL: store8:
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; CHECK: st {{[XYZ]}}, r22
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store i8 %y, i8* %x
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ret void
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}
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define void @store16(i16* %x, i16 %y) {
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; CHECK-LABEL: store16:
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; CHECK: st {{[YZ]}}, r22
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; CHECK: std {{[YZ]}}+1, r23
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store i16 %y, i16* %x
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ret void
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}
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define void @store8disp(i8* %x, i8 %y) {
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; CHECK-LABEL: store8disp:
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; CHECK: std {{[YZ]}}+63, r22
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%arrayidx = getelementptr inbounds i8, i8* %x, i16 63
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store i8 %y, i8* %arrayidx
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ret void
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}
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define void @store8nodisp(i8* %x, i8 %y) {
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; CHECK-LABEL: store8nodisp:
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; CHECK: movw r26, r24
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; CHECK: subi r26, 192
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; CHECK: sbci r27, 255
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; CHECK: st {{[XYZ]}}, r22
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%arrayidx = getelementptr inbounds i8, i8* %x, i16 64
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store i8 %y, i8* %arrayidx
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ret void
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}
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define void @store16disp(i16* %x, i16 %y) {
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; CHECK-LABEL: store16disp:
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; CHECK: std {{[YZ]}}+62, r22
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; CHECK: std {{[YZ]}}+63, r23
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%arrayidx = getelementptr inbounds i16, i16* %x, i16 31
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store i16 %y, i16* %arrayidx
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ret void
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}
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define void @store16nodisp(i16* %x, i16 %y) {
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; CHECK-LABEL: store16nodisp:
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; CHECK: subi r24, 192
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; CHECK: sbci r25, 255
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; CHECK: movw r30, r24
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; CHECK: st {{[YZ]}}, r22
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; CHECK: std {{[YZ]}}+1, r23
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%arrayidx = getelementptr inbounds i16, i16* %x, i16 32
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store i16 %y, i16* %arrayidx
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ret void
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}
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define void @store8postinc(i8* %x, i8 %y) {
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; CHECK-LABEL: store8postinc:
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; CHECK: st {{[XYZ]}}+, {{.*}}
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entry:
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%tobool3 = icmp eq i8 %y, 0
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br i1 %tobool3, label %while.end, label %while.body
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while.body: ; preds = %entry, %while.body
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%dec5.in = phi i8 [ %dec5, %while.body ], [ %y, %entry ]
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%x.addr.04 = phi i8* [ %incdec.ptr, %while.body ], [ %x, %entry ]
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%dec5 = add i8 %dec5.in, -1
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%incdec.ptr = getelementptr inbounds i8, i8* %x.addr.04, i16 1
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store i8 %dec5, i8* %x.addr.04
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%tobool = icmp eq i8 %dec5, 0
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br i1 %tobool, label %while.end, label %while.body
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while.end: ; preds = %while.body, %entry
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ret void
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}
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define void @store16postinc(i16* %x, i16 %y) {
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; CHECK-LABEL: store16postinc:
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; CHECK: st {{[XYZ]}}+, {{.*}}
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; CHECK: st {{[XYZ]}}+, {{.*}}
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entry:
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%tobool3 = icmp eq i16 %y, 0
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br i1 %tobool3, label %while.end, label %while.body
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while.body: ; preds = %entry, %while.body
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%dec5.in = phi i16 [ %dec5, %while.body ], [ %y, %entry ]
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%x.addr.04 = phi i16* [ %incdec.ptr, %while.body ], [ %x, %entry ]
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%dec5 = add nsw i16 %dec5.in, -1
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%incdec.ptr = getelementptr inbounds i16, i16* %x.addr.04, i16 1
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store i16 %dec5, i16* %x.addr.04
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%tobool = icmp eq i16 %dec5, 0
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br i1 %tobool, label %while.end, label %while.body
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while.end: ; preds = %while.body, %entry
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ret void
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}
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define void @store8predec(i8* %x, i8 %y) {
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; CHECK-LABEL: store8predec:
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; CHECK: st -{{[XYZ]}}, {{.*}}
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entry:
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%tobool3 = icmp eq i8 %y, 0
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br i1 %tobool3, label %while.end, label %while.body
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while.body: ; preds = %entry, %while.body
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%dec5.in = phi i8 [ %dec5, %while.body ], [ %y, %entry ]
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%x.addr.04 = phi i8* [ %incdec.ptr, %while.body ], [ %x, %entry ]
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%dec5 = add i8 %dec5.in, -1
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%incdec.ptr = getelementptr inbounds i8, i8* %x.addr.04, i16 -1
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store i8 %dec5, i8* %incdec.ptr
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%tobool = icmp eq i8 %dec5, 0
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br i1 %tobool, label %while.end, label %while.body
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while.end: ; preds = %while.body, %entry
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ret void
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}
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define void @store16predec(i16* %x, i16 %y) {
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; CHECK-LABEL: store16predec:
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; CHECK: st -{{[XYZ]}}, {{.*}}
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; CHECK: st -{{[XYZ]}}, {{.*}}
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entry:
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%tobool3 = icmp eq i16 %y, 0
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br i1 %tobool3, label %while.end, label %while.body
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while.body: ; preds = %entry, %while.body
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%dec5.in = phi i16 [ %dec5, %while.body ], [ %y, %entry ]
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%x.addr.04 = phi i16* [ %incdec.ptr, %while.body ], [ %x, %entry ]
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%dec5 = add nsw i16 %dec5.in, -1
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%incdec.ptr = getelementptr inbounds i16, i16* %x.addr.04, i16 -1
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store i16 %dec5, i16* %incdec.ptr
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%tobool = icmp eq i16 %dec5, 0
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br i1 %tobool, label %while.end, label %while.body
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while.end: ; preds = %while.body, %entry
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ret void
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}
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