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aa4f835b48
Allow instructions such as 'cmp w0, #(end - start)' by folding the expression into a constant. For ELF, we fold only if the symbols are in the same section. For MachO, we fold if the expression contains only symbols that are not linker visible. Fixes https://llvm.org/bugs/show_bug.cgi?id=18920 Differential Revision: https://reviews.llvm.org/D23834 llvm-svn: 283862
62 lines
1.5 KiB
ArmAsm
62 lines
1.5 KiB
ArmAsm
// RUN: llvm-mc -triple aarch64-darwin -filetype=obj %s -o - | llvm-objdump -r -d - | FileCheck %s
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// RUN: llvm-mc -triple aarch64-ios -filetype=obj %s -o - | llvm-objdump -r -d - | FileCheck %s
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visible:
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.space 8
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Lstart:
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.space 8
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Lend:
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adds w0, w1, #(Lend - Lstart)
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adds x0, x1, #(Lend - Lstart)
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add w0, w1, #(Lend - Lstart)
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add x0, x1, #(Lend - Lstart)
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cmp w0, #(Lend - Lstart)
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cmp x0, #(Lend - Lstart)
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sub w0, w1, #(Lend - Lstart)
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sub x0, x1, #(Lend - Lstart)
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// CHECK: adds w0, w1, #8
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// CHECK: adds x0, x1, #8
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// CHECK: add w0, w1, #8
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// CHECK: add x0, x1, #8
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// CHECK: cmp w0, #8
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// CHECK: cmp x0, #8
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// CHECK: sub w0, w1, #8
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// CHECK: sub x0, x1, #8
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add w0, w1, #(Lend - Lstart), lsl #12
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cmp w0, #(Lend - Lstart), lsl #12
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// CHECK: add w0, w1, #8, lsl #12
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// CHECK: cmp w0, #8, lsl #12
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add w0, w1, #((Lend - Lstart) >> 2)
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cmp w0, #((Lend - Lstart) >> 2)
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// CHECK: add w0, w1, #2
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// CHECK: cmp w0, #2
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add w0, w1, #(Lend - Lstart + 12)
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cmp w0, #(Lend - Lstart + 12)
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// CHECK: add w0, w1, #20
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// CHECK: cmp w0, #20
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add w0, w1, #(Lforward - Lend)
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cmp w0, #(Lforward - Lend)
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// CHECK: add w0, w1, #320
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// CHECK: cmp w0, #320
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add w0, w1, #(Lstart - visible)
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cmp w0, #(Lstart - visible)
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// CHECK: add w0, w1, #8
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// CHECK: cmp w0, #8
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// Add some filler so we don't have to modify #(Lforward - Lend) if we add more
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// instructions above
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Lfiller:
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.space 320 - (Lfiller - Lend)
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Lforward:
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.space 4
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add w0, w1, #(. - Lforward)
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cmp w0, #(. - Lforward)
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// CHECK: add w0, w1, #4
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// CHECK: cmp w0, #8
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