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commit 49bc41b64239c4726f31fa35a1af4f22fb41d51f
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Author: Paul A. Clarke <pc@us.ibm.com>
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Date: Tue Jun 11 14:37:37 2019 -0500
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[powerpc] add 'volatile' to asm
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Add 'volatile' keyword to a few asm statements, to force the compiler
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to generate the instructions therein.
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Some instances were implicitly volatile, but adding keyword for consistency.
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2019-06-19 Paul A. Clarke <pc@us.ibm.com>
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* sysdeps/powerpc/fpu/fenv_libc.h (relax_fenv_state): Add 'volatile'.
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* sysdeps/powerpc/fpu/fpu_control.h (__FPU_MFFS): Likewise.
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(__FPU_MFFSL): Likewise.
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(_FPU_SETCW): Likewise.
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diff --git a/sysdeps/powerpc/fpu/fenv_libc.h b/sysdeps/powerpc/fpu/fenv_libc.h
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index a0128c66444a3e46..d6945903b525748e 100644
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--- a/sysdeps/powerpc/fpu/fenv_libc.h
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+++ b/sysdeps/powerpc/fpu/fenv_libc.h
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@@ -57,9 +57,9 @@ extern const fenv_t *__fe_mask_env (void) attribute_hidden;
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#define relax_fenv_state() \
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do { \
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if (GLRO(dl_hwcap) & PPC_FEATURE_HAS_DFP) \
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- asm (".machine push; .machine \"power6\"; " \
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+ asm volatile (".machine push; .machine \"power6\"; " \
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"mtfsfi 7,0,1; .machine pop"); \
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- asm ("mtfsfi 7,0"); \
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+ asm volatile ("mtfsfi 7,0"); \
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} while(0)
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/* Set/clear a particular FPSCR bit (for instance,
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diff --git a/sysdeps/powerpc/fpu_control.h b/sysdeps/powerpc/fpu_control.h
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index 62c478d72ae660cb..90063d77bbbf794f 100644
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--- a/sysdeps/powerpc/fpu_control.h
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+++ b/sysdeps/powerpc/fpu_control.h
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@@ -98,7 +98,7 @@ typedef unsigned int fpu_control_t;
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/* Macros for accessing the hardware control word. */
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# define __FPU_MFFS() \
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({register double __fr; \
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- __asm__ ("mffs %0" : "=f" (__fr)); \
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+ __asm__ __volatile__("mffs %0" : "=f" (__fr)); \
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__fr; \
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})
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@@ -112,7 +112,7 @@ typedef unsigned int fpu_control_t;
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#ifdef _ARCH_PWR9
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# define __FPU_MFFSL() \
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({register double __fr; \
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- __asm__ ("mffsl %0" : "=f" (__fr)); \
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+ __asm__ __volatile__("mffsl %0" : "=f" (__fr)); \
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__fr; \
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})
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#else
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@@ -132,7 +132,7 @@ typedef unsigned int fpu_control_t;
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__u.__ll = 0xfff80000LL << 32; /* This is a QNaN. */ \
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__u.__ll |= (cw) & 0xffffffffLL; \
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__fr = __u.__d; \
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- __asm__ ("mtfsf 255,%0" : : "f" (__fr)); \
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+ __asm__ __volatile__("mtfsf 255,%0" : : "f" (__fr)); \
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}
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/* Default control word set at startup. */
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